Self-priming centrifugal pump



Dec. 1941- w. J. REGAR 2,264,953

SELF-PRIMING CENTRIFUGAL PUMP Filed Dec, 5, 1938 I gwm Wdl iqar a 2' W most a direct line toward the outlet 9.

Patented Dec. 2, 1941 William J. Regar, Tampa, Fla. Application December 5, 1938, Serial No. 244,020

. 1 Claim.

This invention relates to that type of centrifugal pump in which a priming water reservoirprovides water for circulation within the pump after it is started, and it has for its primary object to provide an eductorfllet to draw airrapidly out of the suction line.

Another important object of the invention is to eliminate a great deal of friction by'causing the flow of water through the pump to be in as direct a line as possible, and to be in the same direction as the movement of the impeller blades.

A further object of the invention is to provide a construction in which expensive castings are not necessary but which may be assembled from drawn steel tubing and sheet metal by welding processes, thus lowering the cost of production.

In the drawing illustrating a preferred construction, Figure 1 is a vertical sectional view in the planes indicated by the broken line II of Fig. 2 and Fig. 2 is a vertical sectional view in the planes indicated by the broken line II-II of Fig. 1.

The priming water reservoir I has a' discharge port 2 located near its top and has the pump case 3 for the rotating impeller 4 supported inside the reservoir near the front surface. A closure plate 5 secured to the reservoir case has a central passage 6 for the impeller shaft 7 provided with any suit le packing means 8. The pump case has an ou et 9 in its periphery, preferably near the bottom through which the water is thrown by the impeller and has an inlet 10 ofiset to one side of the. axis of the impeller shaft. 'The suction pipe H extends from near the top of the reservoir I downward to the inlet I0 so that water entering the pump case flows in the direction of movement of the rotating impeller blades in al- A swinging check valve of the ordinary type is shown at the point where the pipe II is connected to the pipe 13 leading from the source of supply.

A baffle plate It extends from the front wall of the reservoir below and in the rear of the outlet 9 across the reservoir to within a short distance of the rear wall. The front end of this baflie plate directs the water leaving the outlet 9 against the curved wall of the reservoir leading upward to the outlet port 2. A portion of the water will be driven around the reservoir until it is checkedby the'baiile plate. A tube l5 has.

its open lower end directed toward the oncoming water, while its upper end discharges into the pipe II .at a little distance from the inlet l0.

Water rushing up the tube will enter the pipe II as a jet which will act at every turn of the propeller to carry some of the air through the outlet 9. Within a few seconds after starting, the air in the suction pipe will all be removed and the pump will then run as an ordinary centrifugal pump. The location of the lower end of the tube l5 near the bottom of the reservoir makes it possible to operate the pump with a minimum quantity of priming water.

A clean-out plug is near the bottom of the reservoir affords easy access to the space behind the bafile plate. I

It will be seen that the construction shown and described can readily be made from tubing and sheet metal by simple welding and that there are no diflicultiesin the assembly. The pipe H will ordinarilyhave only a single curve and by arranging the inlet 'at one side of the axis of the impeller anddelivering the water at an angle such that its direction of movement will correspond with the downward movement of the blades of the impeller, there will be very little friction as compared with the usual arrangements.

The illustration and description are to be taken as merely those of a single embodiment of the invention, since many changes in size, form. proportion, and arrangement of parts may be made by those skilled in the art without departure from the invention as claimed.

I claim:

A self-priming centrifugal pump having a priming liquid reservoir, an impeller case having an outlet near its bottom discharging into said reservoir, a suction pipe delivering liquid into the impeller case, a baflie within the reservoir at its lower end to check rotation of liquid therein, and a tubular conduit having its lower end within the reservoir adjacent to the bafiie and its upper end arranged to discharge liquid into the suction pipe at alittle distance from its inlet into the impeller-case.

WILLIAM J. REGAR. 

